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Diablo 4 Item Upgrades Upgrades to items allow players to increase the level of equippable items such as weapons, armor, and trinkets above a certain threshold. They can be purchased at any upgrader NPC with the appropriate currency. Upgrade components are slotted into equipment to offer bonus effects and attribute bonuses. They are generally slot-restricted, but there are some universal upgrades. Rerolling A player can roll an upgrade for an item in Diablo 4. This is done through the Level Up mechanic,